namespace MyPing
{
using System;
using System.Net;
using System.Net.Sockets;
public class IcmpPacket
{
public Byte Type; // type of message
public Byte SubCode; // type of sub code
public UInt16 CheckSum; // ones complement checksum of struct
public UInt16 Identifier; // identifier
public UInt16 SequenceNumber; // sequence number
public Byte [] Data;
} // class IcmpPacket
class Ping
{
const int SOCKET_ERROR = -1;
const int ICMP_ECHO = 8;
public static void Main(string[] argv)
{
if(argv.Length==0)
{
Console.WriteLine("Usage:Ping <hostname> -t") ;
Console.WriteLine("<hostname> The name of the Host who you want to ping");
Console.WriteLine("-t Optional Switch to Ping the host continuously") ;
}
else if(argv.Length==1)
{
PingHost(argv[0]) ;
}
else if(argv.Length==2)
{
if(argv[1]=="-t")
{
while(true)
{
PingHost(argv[0]) ;
}
}
else
{
PingHost(argv[0]) ;
}
}
else
{
Console.WriteLine("Error in Arguments") ;
}
}
public static void PingHost(string host)
{
IPHostEntry serverHE, fromHE;
int nBytes = 0;
int dwStart = 0, dwStop = 0;
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
try
{
serverHE = Dns.GetHostByName(host);
}
catch(Exception)
{
Console.WriteLine("Host not found"); // fail
return ;
}
IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0);
EndPoint epServer = (ipepServer);
fromHE = Dns.GetHostByName(Dns.GetHostName());
IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0);
EndPoint EndPointFrom = (ipEndPointFrom);
int PacketSize = 0;
IcmpPacket packet = new IcmpPacket();
packet.Type = ICMP_ECHO; //8
packet.SubCode = 0;
packet.CheckSum = UInt16.Parse("0");
packet.Identifier = UInt16.Parse("45");
packet.SequenceNumber = UInt16.Parse("0");
int PingData = 32; // sizeof(IcmpPacket) - 8;
packet.Data = new Byte[PingData];
for (int i = 0; i < PingData; i++)
packet.Data[i] = (byte)'#';
PacketSize = PingData + 8;
Byte [] icmp_pkt_buffer = new Byte[ PacketSize ];
Int32 Index = 0;
Index = Serialize(packet,icmp_pkt_buffer,PacketSize,PingData);
if( Index == -1 )
{
Console.WriteLine("Error in Making Packet");
return ;
}
Double double_length = Convert.ToDouble(Index);
Double dtemp = Math.Ceiling( double_length / 2);
int cksum_buffer_length = Convert.ToInt32(dtemp);
UInt16 [] cksum_buffer = new UInt16[cksum_buffer_length];
int icmp_header_buffer_index = 0;
for( int i = 0; i < cksum_buffer_length; i++ )
{
cksum_buffer[i] =
BitConverter.ToUInt16(icmp_pkt_buffer,icmp_header_buffer_index);
icmp_header_buffer_index += 2;
}
UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length);
packet.CheckSum = u_cksum;
Byte [] sendbuf = new Byte[ PacketSize ];
Index = Serialize(packet,sendbuf,PacketSize,PingData);
if( Index == -1 )
{
Console.WriteLine("Error in Making Packet");
return ;
}
dwStart = System.Environment.TickCount; // Start timing
if ((nBytes = socket.SendTo(sendbuf, PacketSize, 0, epServer)) == SOCKET_ERROR)
{
Console.WriteLine("Socket Error cannot Send Packet");
}
Byte [] ReceiveBuffer = new Byte[256];
nBytes = 0;
bool recd =false ;
int timeout=0 ;
while(!recd)
{
nBytes = socket.ReceiveFrom(ReceiveBuffer, 256, 0, ref EndPointFrom);
if (nBytes == SOCKET_ERROR)
{
Console.WriteLine("Host not Responding") ;
recd=true ;
break;
}
else if(nBytes>0)
{
dwStop = System.Environment.TickCount - dwStart; // stop timing
Console.WriteLine("Reply from "+epServer.ToString()+" in "+dwStop+"MS,\tBytes Received :"+nBytes);
recd=true;
break;
}
timeout=System.Environment.TickCount - dwStart;
if(timeout>1000)
{
Console.WriteLine("Time Out") ;
recd=true;
}
}
socket.Close();
}
public static Int32 Serialize( IcmpPacket packet, Byte [] Buffer, Int32 PacketSize, Int32 PingData )
{
Int32 cbReturn = 0;
int Index=0;
Byte [] b_type = new Byte[1];
b_type[0] = (packet.Type);
Byte [] b_code = new Byte[1];
b_code[0] = (packet.SubCode);
Byte [] b_cksum = BitConverter.GetBytes(packet.CheckSum);
Byte [] b_id = BitConverter.GetBytes(packet.Identifier);
Byte [] b_seq = BitConverter.GetBytes(packet.SequenceNumber);
Array.Copy( b_type, 0, Buffer, Index, b_type.Length );
Index += b_type.Length;
Array.Copy( b_code, 0, Buffer, Index, b_code.Length );
Index += b_code.Length;
Array.Copy( b_cksum, 0, Buffer, Index, b_cksum.Length );
Index += b_cksum.Length;
Array.Copy( b_id, 0, Buffer, Index, b_id.Length );
Index += b_id.Length;
Array.Copy( b_seq, 0, Buffer, Index, b_seq.Length );
Index += b_seq.Length;
Array.Copy( packet.Data, 0, Buffer, Index, PingData );
Index += PingData;
if( Index != PacketSize )
{
cbReturn = -1;
return cbReturn;
}
cbReturn = Index;
return cbReturn;
}
public static UInt16 checksum( UInt16[] buffer, int size )
{
Int32 cksum = 0;
int counter;
counter = 0;
while ( size > 0 )
{
UInt16 val = buffer[counter];
cksum += Convert.ToInt32( buffer[counter] );
counter += 1;
size -= 1;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
return (UInt16)(~cksum);
}
} // class ping
}